function impressum()
{
window.open('http://www.memberbereiche.de/impressum.php','Info','width=300,height=300,left=0,top=0,screenX=0,screenY=0');
}

function vorschau(url,nom,params){
var Breite_intern;
var Hoehe_intern;
Breite_intern = (window.screen.width) - (10);
Hoehe_intern = (window.screen.height) - (110);
var win2 = window.open(url,'popup',"height=" + Hoehe_intern + ",width=500,resizable=yes,left=50,top=0,screenX=0,screenY=0,scrollbars=yes");
win2.focus();
}